W55RP20 iperf3 Example (TOE, LwIP)
W55RP20 iperf3 Example (TOE, LwIP)
WIZnet - W55RP20-EVB-Pico
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Changes from iperf2 to iperf3
1. TCP Transmission Structure Changes
iperf2 and iperf3 differ in the format of data packets and control messages. Specifically, iperf3 handles an initial handshake by exchanging metadata in JSON format.
2. Buffer Size Adjustment
iperf3 transmits larger data blocks by default. It is necessary to check the current ETHERNET_BUF_MAX_SIZE setting and increase the buffer size if needed.
3. JSON Parser Addition
Since iperf3 uses JSON messages, a simple JSON parser must be added or a relevant library included.
4. Speed Measurement and Report Processing
iperf3periodically sends performance reports, requiring additional logic for handling them.- Add logic to calculate transmitted/received bytes.
- Send results in JSON format at each measurement interval.
Performance Reporting in iperf2 vs. iperf3
iperf2 Performance Reporting
- While iperf2 does provide throughput reporting, the method is relatively simple between the client and server.
- It primarily calculates the periodic data transfer (in bytes) and elapsed time, with output results displayed on the client side.
- The server only receives data and does not send separate performance reports to the client.
iperf3 Performance Reporting
- iperf3 periodically calculates performance data on the server and sends it to the client in JSON-formatted reports.
- The client parses these reports and displays periodic performance results.
- Reports include transmitted/received bytes, duration, RTT, packet loss rate, retransmission rate, and more detailed metrics.
- Therefore, iperf3 server code requires logic to compute performance data and periodically generate and send reports.
Requirements for iperf3 Testing
To test iperf3, the following are required:
iperf3 Download Link:
Official iperf3 Download
W55RP20 iperf3 TOE/LwIP Code:
- TOE Code : https://github.com/WIZnet-ioNIC/WIZnet-PICO-IPERF-C/tree/main/examples/iperf3/toe
LwIP Code : https://github.com/WIZnet-ioNIC/WIZnet-PICO-IPERF-C/tree/main/examples/iperf3/lwip
Run command prompt to enter the iPerf command and move to iPerf path.
/* Change directory */
// change to the 'iperf-x.x.x-winxx' directory.
cd [user path]/iperf3.xx_xx
// e.g.
cd D:/iperf3.16_64
In the command prompt, enter the following command to connect to Raspberry Pi Pico, W5100S-EVB-Pico or W5500-EVB-Pico running as a TCP server and test.
/* Network performance measurement test */
.\iperf3 -c [connecting to] -t [time in seconds to transmit for] -i [seconds between periodic bandwidth reports]
// e.g.
.\iperf -c 192.168.11.2 -t 10 -t 1
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iPerf3 Example
